Condensed Consolidated and Combined Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Beginning balance (in shares) at Dec. 31, 2022		165,300
Beginning balance at Dec. 31, 2022	$ 2,731.7	$ 1.7	$ 2,372.3	$ 457.3	$ (99.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	93.8			93.8
Other Comprehensive Income (Loss), Net of Tax	3.6				3.6
Dividends, Common Stock	$ (29.3)			(29.3)
Share repurchases (in shares)	(300)	(300)
Share repurchases	$ (13.2)		(13.2)
Exercise of options, net of shares tendered for payment (in shares)		200
Stock Issued During Period, Value, Stock Options Exercised	5.1		5.1
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0.0
Issuance of restricted shares, net of cancellations		700
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(7.5)	$ (0.2)	(7.5)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	5.7		5.7
Ending balance (in shares) at Mar. 31, 2023		165,700
Ending balance at Mar. 31, 2023	2,789.9	$ 1.7	2,362.4	521.8	(96.0)
Beginning balance (in shares) at Dec. 31, 2023		165,100
Beginning balance at Dec. 31, 2023	3,142.1	$ 1.7	2,339.1	905.3	(104.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	105.1			105.1
Other Comprehensive Income (Loss), Net of Tax	(8.6)				(8.6)
Dividends, Common Stock	(32.1)			(32.1)
Exercise of options, net of shares tendered for payment (in shares)		500
Stock Issued During Period, Value, Stock Options Exercised	10.0		10.0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0.0
Issuance of restricted shares, net of cancellations		600
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(10.8)	$ (0.2)	(10.8)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	6.6		6.6
Ending balance (in shares) at Mar. 31, 2024		166,000
Ending balance at Mar. 31, 2024	$ 3,212.3	$ 1.7	$ 2,344.9	$ 978.3	$ (112.6)